People go to a lot of trouble and expense to make their shop and front counter. Sometimes what you see on the front counter an old computer screen like this one.
It is firstly taking up a lot of room on the most valuable and best spot in your shop, that space should and could be used far better. A monitor can often, for example, be raised on a stand, so take up no room on the front counter and be better positioned for the cashier too
More importantly, it is making a wrong impression to your customers on your business. With such an ancient monitor what are they thinking of your software and technology?
I would suggest getting a monitor that is modern, stylish and sleek. This will enhance your shop and move the old one to the back where no-one sees it.
Here is an idea get a monitor in colour, now that makes a bold statement about your shop, matches your shop colours and a cool talking point.